refactor(FinancialPanorama): 重构为 SubTabContainer 二级导航

- 主组件从 Chakra Tabs 迁移到 SubTabContainer
  - 新增 PeriodSelector 时间选择器组件
  - IndustryRankingView 增加深色主题支持
  - 拆分出 6 个独立 Tab 组件到 tabs/ 目录
  - 类型定义优化，props 改为可选

src/views/Company/components/FinancialPanorama/tabs/OverviewTab.tsx

@@ -0,0 +1,51 @@
+/**
+ * 财务概览 Tab
+ */
+
+import React from 'react';
+import { VStack } from '@chakra-ui/react';
+import { ComparisonAnalysis, FinancialMetricsTable } from '../components';
+import type { FinancialMetricsData, ComparisonData } from '../types';
+
+export interface OverviewTabProps {
+  comparison: ComparisonData[];
+  financialMetrics: FinancialMetricsData[];
+  showMetricChart: (name: string, key: string, data: unknown[], path: string) => void;
+  calculateYoYChange: (value: number, period: string, data: unknown[], path: string) => { change: number; intensity: number };
+  getCellBackground: (change: number, intensity: number) => string;
+  positiveColor: string;
+  negativeColor: string;
+  bgColor: string;
+  hoverBg: string;
+}
+
+const OverviewTab: React.FC<OverviewTabProps> = ({
+  comparison,
+  financialMetrics,
+  showMetricChart,
+  calculateYoYChange,
+  getCellBackground,
+  positiveColor,
+  negativeColor,
+  bgColor,
+  hoverBg,
+}) => {
+  const tableProps = {
+    showMetricChart,
+    calculateYoYChange,
+    getCellBackground,
+    positiveColor,
+    negativeColor,
+    bgColor,
+    hoverBg,
+  };
+
+  return (
+    <VStack spacing={4} align="stretch">
+      <ComparisonAnalysis comparison={comparison} />
+      <FinancialMetricsTable data={financialMetrics} {...tableProps} />
+    </VStack>
+  );
+};
+
+export default OverviewTab;